High-Efficiency, Low-Loss Floquet-mode Traveling Wave Parametric Amplifier Characterization and Measurement - INSPIRE

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High-Efficiency, Low-Loss Floquet-mode Traveling Wave Parametric Amplifier Characterization and Measurement

Jennifer Wang
(
- MIT and
- MIT, LNS
)
,
Kaidong Peng
(
- MIT and
- MIT, LNS
)
,
Gregory D. Cunningham
(
- MIT and
- MIT, LNS
)
,
Andres Lombo
(
- MIT and
- MIT, LNS
)
,
Alec Yen
(
- MIT and
- MIT, LNS
)

Mar 14, 2025

e-Print:

2503.11812 [quant-ph]

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Abstract: (arXiv)

Advancing error-corrected quantum computing and fundamental science necessitates quantum-limited amplifiers with near-ideal quantum efficiency and multiplexing capability. However, existing solutions achieve one at the expense of the other. In this work, we experimentally demonstrate the first Floquet-mode traveling-wave parametric amplifier (Floquet TWPA). Fabricated in a superconducting-qubit process, our Floquet TWPA achieves minimal dissipation, quantum-limited noise performance, and broadband operation. Our device exhibits

>20

-dB amplification over a

3

-GHz instantaneous bandwidth,

<\!0.5

-dB average in-band insertion loss, and the highest-reported intrinsic quantum efficiency for a TWPA of

92.1\pm7.6\%

, relative to an ideal phase-preserving amplifier. When measuring a superconducting qubit, our Floquet TWPA enables a system measurement efficiency of

65.1\pm5.8\%

, the highest-reported in a superconducting qubit readout experiment utilizing phase-preserving amplifiers to the best of our knowledge. These general-purpose Floquet TWPAs are suitable for fast, high-fidelity multiplexed readout in large-scale quantum systems and future monolithic integration with quantum processors.

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